Process of making colored cement.



COMPOSITIONS, -OATING OR PLASTIC CROSS REFERENCE some cor'rnn. rnmon, oran rmcrsco, car-mom rnocnss or name oononsnonunnr.

170 Drawing. App1ication med June 18,

To all whom it may concern:

Be it known that I, JOHN Corrnn PELTON,

a citizen of the United States residing at San Francisco, in the countyof gen Francisco and State of California, have invented 'a r new anduseful Process of Making Colored the to be obtained, and I .-iron, and Ipulverize extent. esir Cement. p

This invention relates to a colored mineral product adapted to be usedin building construction or for other uses, for example, .001- oredsand, cement, colored whiting or Paris white, .colored chalk, coloredlitharge and the like, and the main object of the present invention isto provide a mineral product of this character which may be produced inany desired shade of color, and adapted for use in buildings or blocksor otherwise without tar mixture of any extraneous coloring mat- Afurther object is to provide for securing the greatest possibleuniformity in coloring. The invention consists of saturating a mineralproduct with a mineral solution, and then drying and burning thematerial to form the desired color, and then grinding As a coloringmatter I use a metallic salt or compound, capable of adding color to theproduct to be colored. The nature of said salt or compound depends uponthe color which is apply this metallic compound to the mineral productin the form of a solution, while it is dissolved or sufilended in asuitable solvent or carrying m um, and the mineral product becom Isoaked and impregnated with the solution, and is then dried and burned,which brin the color and fixes the same permanently in the mineral.:

In producing a product, such as Portland cement for example, having abufl, brown or black color, I use a salt or compound of ferric and forma paste thereof with commercial sulfuric acid. I dilute this e y" varythe shade of color.

' Commercial Portland cement is then soaked The shade of color may bevaried b with the $0111 1011 mas o ome saturated therewith andtheproduct is then burned: or

This restores the original prop'erca ed. tree 0 he cement and brings outthe color.-

y y g- "the dilution of the solvent before men-- 1914. Serial no.545,799. A

tioned. After burning, I grind up the material and the resultant productis a Portland cement having a permanent color-of the desired shade. 1111producing a colored whitin or chalk or lithar e or any like m'atmke,except that the temperature of in may be varied to reduce differentshades of color.

. y using metallic salts of other kinds other colors may be produced.For example, to produce ablpe color, a copper salt is employed. For thispurpose pure co er ma be dissolved in nitric acid and the cement orother produa E E colored may then be soaked in the solution for sometime, and then burned to deepen the color of the same to the pointdesired. continuing the burning operation to a su cient extent, 'a blackproduct may be produced. Where whiting is prepared in this manner andused in plasterin a vperfect color is produced throughout t e body ofthe plaster, calcimining is dispensed with, and if the plasteringbecomes broken or chipped it does not mar the appearance as the color isnot on the surface only, but is uniformly distributed throughout. I r 4Theabove described process is applicable to any'cementitious materialwhich is composed of mineral constituents and which deends on the actionof calcination or heat to ring it to a condition in which it will setwhen mixed with water and the expresslon cenientitious mineral productis herein used in this sense.

What I claim is: 1. The process of making colored cement,

Examiner which processcomprises saturating Portwhich process comprisessaturatin Portlan cement with a solution ofa meta ic-salt capable ofadding color to the cement, burning the 'colored cement, and thengrinding the burned and colored cement torestore-the 1 originalproperties of the cement and bring .outthe color.

a The pr cesspf 2. The process of making colored cementi ma ng coloredcement,

which process comprises saturating Portland cement with a paste formedof ferric sulfid and sulfuric acid to color the cement, burning thecolored cement, and then grind- 5 ing the burned and colored cement torestore the original properties of the cement and bring out the color.

In testimon whereof, I have hereunto set my hand'at s Angeles,California, this 13th day of June, 1914.

JOHN COTTER PELTON.

In presence of LORA M. BowERs, LORRAINE E. Dmmow.

